l IP addresses of the interfaces on both ends of the GRE tunnel
Procedure
Step 1 Assign an IP address to each interface.
Assign an IP address to each interface as shown in Figure 1-6. The specific configuration is not
mentioned here.
Step 2 Configure IGP for the VPN backbone network.
The specific configuration procedures are the same as those in 1.7.1 Example for Configuring
a Static Route for GRE and are not mentioned here.
Step 3 Configuring the tunnel interfaces
The specific configuration procedures are the same as those in 1.7.1 Example for Configuring
a Static Route for GRE and are not mentioned here.
Step 4 Configure OSPF on the tunnel interfaces.
# Configure Router A.
[RouterA] ospf 2
[RouterA-ospf-2] area 0
[RouterA-ospf-2-area-0.0.0.0] network 40.1.1.0 0.0.0.255
[RouterA-ospf-2-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[RouterA-ospf-2-area-0.0.0.0] quit
[RouterA-ospf-2] quit
# Configure Router C.
[RouterC] ospf 2
[RouterC-ospf-2] area 0
[RouterC-ospf-2-area-0.0.0.0] network 40.1.1.0 0.0.0.255
[RouterC-ospf-2-area-0.0.0.0] network 10.2.1.0 0.0.0.255
[RouterC-ospf-2-area-0.0.0.0] quit
[RouterC-ospf-2] quit
Step 5 Verify the configuration.
After the configuration, run the display ip routing-table command on Router A and Router C.
You can find the OSPF route to the network segment of the remote user end through the tunnel
interface. Moreover, the next hop to the destination physical address (30.1.1.0/24) of the tunnel
is not the tunnel interface.
Take Router A as an example:
[RouterA] display ip routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 11 Routes : 11
Destination/Mask Proto Pre Cost Flags NextHop Interface
10.1.1.0/24 Direct 0 0 D 10.1.1.2
GigabitEthernet2/0/0
10.1.1.2/32 Direct 0 0 D 127.0.0.1 InLoopBack0
10.2.1.0/24 OSPF 10 2 D 40.1.1.2 Tunnel0/0/1
20.1.1.0/24 Direct 0 0 D 20.1.1.1
GigabitEthernet1/0/0
20.1.1.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
30.1.1.0/24 OSPF 10 2 D 20.1.1.2
GigabitEthernet1/0/0
40.1.1.0/24 Direct 0 0 D 40.1.1.1 Tunnel0/0/1
40.1.1.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
Huawei AR1200 Series Enterprise Routers
Configuration Guide - VPN 1 GRE Configuration
Issue 01 (2012-04-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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